Machine for grinding valves



G. c. HILL AND F. COOPER. MACHINE FOR'GRINDING VALVES.`

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e. c.-H|LL AND F. COOPER. MACHINE For: GRINDING VALVES.' APPLICATION FILED FEB. |41 |920.

1,374,504, .Patented Apr. 12, 1921.

3 sHEEs-sHEET 2.

G. C. HILL AND F. COOPER.; MACHINE FOR GRINDING VALVES.

APPLlcATloN FILED FEB.14, 1920. 1,374,504. 1 Patented Apr. 12, 1921.

3 SHEETS-SHEET 3.

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UNITED STATESJ 'PATENT orficia'fv lfenoiwrnzcLrrroRD lHILL AND FRANK COOPER, or SEATTLE, WASHINGTON MACHINE FOR GRINDINGvALvEs.

1 Y spe-einsamen offiettersratent. i ,.PatentedAprl Application iea February 14,1920. seriai'No. 358,610. l

To all whom it may concern.'

'Be it known that' we, GEORGE CLIFFORD HILL, acitizen of the United States, and

vothers skilled in the art to which it appertains to make and use the same.

`This invention relates to machines for grinding valves, and particularly Jfor grindfr valves which arefdetaohable from the cylinder blockV of gas engines.

to pro- I vide Aa machine for grinding movable-.valves i against .each other the valveparts, which A by the operation oi moving and` rotating lparts are moved by the machine to vinsure an even face on each part, the. movementA Vof Onezpart being 'alternately in vopposite directions. Y i. Anotherv object is to 'provide a machine f whereby the4 parts of .movable valves may f bexquickly ground togetherto assure a tightl joint when the valve. is closed, and whereby the zparts being ground may beadjusted into the moving machine and removed therefrom without the stopping of the machine.

Another object is to provide a machine wherein afplurality of valves may be simul- 'taneouslyt ground, and` any one ofthe parte of any of' theivalves in the machine' may be removed' without moving any of the other parts. Y

i -Anothei-object is to provide" a machine Vwherein the valve seat may beheld rigid and moved or permitted to move at fixed periods, and7 the` valve 'part is continuously f' rotated in opposite directionsalternately7 'and Ywhereby-the valveseatgis held against ythe valve portion by resilient vtension while fthe parts are in contact fongrinding. i Anotherobject is to provide a machine fonrgrinding with grinding material'with rfacilidzies'for; applying the saine.

Th e.invention consists of thenovel arrangement, structure andi combination of parts as hereinafter more vparticularly described.,

" Three sheets of. Ydrawings accompany this -specification-, in which like referencecharacters designateflikefparts throughout,

inv f. Machines for Grinding igurel is a'V front elevation showingl thel machine in operating'position grinding two valves;

F ig. 2 is a side elevation; a

"F ig. 3 .is a vcrosssection .inthe centerline of the chuck; l

F ig. 4 is a plan View showing the driving mechanism which drives'the valve stems upward and forward.'

This invention is designed primarily `for grinding the valves of Buick automobiles,-

in which engines ,are constructed with'av rel movable cage or tube having one .end providedv with a valve` seat., Both the intake and exhaust valves are similarly constructed, except that the inlet valve is'madeelarger than the exhaust', as shown 'the'respective `"cages AQ and AonFigsfl ',and2.

y this machine the Valvewseat S'Qhel-d ,exactly perpendiculariby the table andadjusting ngersof the machine,V and thevalve stemY is` held-exactly perpendicular in the chuck holder shown,'fwhichfthereby assures the valve and seat when ground .together to be in perfect alinement, andi true-jointlbetween the parts will follow-,1 when thev two parts are taken' froinjthe` grinding machine and adjusted in their respective-positions on-theengine. L Y f As the cage-is released at stated; periods during'the grindingprocess, the friction of the, movingfvalve will turngthie ,cage a short' distance, so that asitheftwoparts are again thrown togetherby'thereleasing ofthe cam actionpnthe tablelbelow, thevalve will grind in fa,l differ-'ent` position in the seat, and the repeated .reverse-motionsgof the chuck with the valve assures an even g'rindfV ing on' every part 'of the...adjoiningfaces; -1

.Wlhile the grinding' Ais 'p'roceedinggi` the yoperator at timesplaces a mixture :of lemery, Y powder or other grinding powderfprefern yor -on thevinner wall yof thefcage, and-as the 1 two partsg are drawn apartand .then ,thrown solution 1 evenly' together the grinding spreads over ,the faces beingqground there.-

by; Ait :is understood -that a simple means f `may be providedfor supplyingthis liquid #grinding solution by either pumpor gravity.

" As illustrated in the drawings-the inven 8 5, a,verticalframezh anda table 2', having a@ verticaly apron 2Ak provided? withi vertical. slotsg in 'slidable engagement- ,with

' tion is embodiedin a machinehavingabas'e liio l gui-des 40 on fratrie-Landboltsadapted to Vslide through slots 39. The table 2 has 46 and 11.` To operating lever 11 is pivoted a` link 12 pivotally connected to a hand lever 13 with handle 20, which is in turn Vpivoted to a fulcrum rod 16V having notches 19 adapted to engage a Aulcrum pin 18 in a 'slot'17 in table 2, through which rod 16 passes. A rod 44 having ahead 43slides 1n sleeve bearing 45, so as to engage lever `46 on rock shaft 7 and Vis normally de pressed by means of the compression spring 44. Mountedin suitable bearings on the frame 1 is a spindle 24vdriven by a sprocket wheel" 25 and chain 26 from drive wheel 29 and sprocket 27. Spindle 24 is provided under table 2 with a cam 23 and a cam f roller 42. ,Cam235 contacts with a roller 30 mounted on a rod 31 pivoted to frame 1 at, v32'and roller 30rin turn engages a nut head 33 mounted on Vtable 2. (Jam roller 42 operates on head 43 of rod 44, which rocks shaft 7 through lever 46. Table 2 is normally held in its lowered kposition by rod 36 Vand compression spring 34 in coperation with base 35.

011 the upper part of frame 1 and mount* edfoverthe openings of table 2 and fingers 10 on rock shaft, and over Vthe driving ,spindle 28 are vertical spindle bearings 48 Vvsimilarly constructed'with ball bearings 49.

The bearing over the driving spindle 28 carries a spindle 50 having on its lower end a bevell gear 51 engaging a similar bevel gear 52 on Nthe driving spindle 28, and having on its up er end a crank lever 53 connected by bolt pin 55 to driving arm 54, which in turn `is lpivoted by pin v56`to`gear 57. Gear 57 engages and drives in successively opposite directions gears 58, which'are connected to clutch carrying spindles 59 carried by the bearings 48, Vlocated over the table openings 4.

he clutches carried by spindles 59 are illustrated'in detail in Fig. 3, in which the bottom of spindle 59 is shown provided with a slot 60. The clutch consists ofY a tube 63 having bushing 62 bored to receive the slotted "end of spindle 59, and a pin 61 Y secures tube 63 and bushingl 62 passing lthrough 'sl,otf60 of `spindle 59. A' spring J64Vbetw`een head 62 and bearings 49 de- Vpresses the clutch against the upward thrust Goff a spring 68 located within tubeV 63 and between bushing 62Vand` a slidable bearing ,Y 65 secured to the lower end of spindle 59 by aV Wire ring 66 seated in adjacent grooves in spindle and bearing. Head 69 is provided with a vertical bore adapted to jreceive a valve stem 83, and the upper end of this bore is enlarged as at 71 to receive the lower end of spindle 59 and a compression spring 74 mounted on a spindle' 73 having a flange 7 3, and extending below said flange into'the smaller bore 75. A washer 72 is interposed between theends of spindles59 and 73. Transversely of head 69 ynear its lower end are two recesses adapted to receive pins 77 adapted to enter the slot of a valve stem 83, and provided with heads 78 having concave seats for balls 79.v` 'Pins 77 are further provided with compression springs 82 tendingto withdraw pins 77 from the bore 75. A sleeve having a bore 73 adapted to receive a compression spring 86,V and a shoulder 87 for'one seat for said" spring 86 is iitted overhead 69. VA washer is interposed between spring 86 land the bottom of tube 63.. The lowerinner edge of sleeve 80 is beveled ask at 81. Oversleeve 8O a knurled sleeve 90 is held by a .wire collar 91 in a groove 92 out in sleeve 80, and rotates freely on said sleeve80 byreason of the ball bearings 93; A bronze washer 88 is seated between; shoulders 87 and 89 y of sleeve y80, and head 69, respectively;

"ln operation, the valves to be" ground are placed on plates 3 and vthe latter'seouredto table 2 by means ofthe bolts'5. In placing the valves on table 2, therock shaft 7l is operated and lifts lingers 10 byv means of hand lever 20, which being pulled'upbythe operator, engages a notch in rod 19 with fulcrum pin 18, depresses link 12, which in turn pulls lever 16 attached toshaft 7. y The y ends of the valve stem are secured in the vchuck head 69 by means ofv pins 7 7, which are withdrawn from bore 75 to permit the entrance of the valve stem byk raising sleeve 80 against the compressionspring 86, thus Y permitting ,balls 79 to drop back'against bevel 81 and permitting the pins 77 to be forced out by springs 82. With the valve stem in place,sleeve 8O is released, and, descending, forces in balls 79 and pins 77, so that the latterenter the slot of the Vvalve stem and secure the stem in non-rotatable relation to the head `69. It will be apparent that spring 174 operates todepress head 69 relatively to spindle 59, operating on said spindle through washer 72. Spring 68', on the other hand, tends to elevate the clutch relatively to spindle 59 against the `buler spr1ng`64. Knurled sleeve 90 enables they operator to adjust sleeve 8O while themachine is'lnmotion. The valve stems secured in the chucks willbe rotated by the latter in successively opposite directions bythe operation of the gears 58 and 57 operated by the crank shaft 54, crank 55,'and beveled gears 51 and 52. At the same time the valve casings secured to table 2 will" be Ysucces- It will thus be apparent that this machine rotates the valve stem in successively opposite directions under varying tensions with regard to the valve seats, successively seats and reseats the valve heads in the valve seats, and permits the rotation and readjustment of the valve seats relatively to the v valve heads all automatically, while at the 'same time means are provided for operat-` ing the attaching devices for both valves and valve stems independently and whilethe machine is in motion. Friction material, such as emery paste, may be fed between the valve heads and Vvalve seats, either by hand or by a suitable feeding 'device, and other modifications of particular structural features will readily suggesty themselves to those skilled in the art, within the scope of the present invention.

What we claim is: l

1. In a machine for grinding portable valves, means for holding the valve seat rigid and means for releasing the holding means at predetermined periods, with means for'holding the valve portion against the seat with resilient pressure, and means for rotating the valve in alternate directions for predetermined limits of movement.

2. A machine for grinding valves, having means for holding the valve seat, means for releasing the seat from the machine without stopping the operation of the machine, means for holding and rotating thelvalve and valve stem, means for releasing the stem and valve from the machine without stopping the same, and means for inserting the seat and valverin place in the machine for grinding without stoppingV the machinery of the moving means. Y

3. A machine for grinding Vportable valves, comprising a frame, a table slidably mounted on said frame having openings over which valves to be ground may be placed, a rock shaft mounted on said table having fingers extending over said open- `in s, ladapted to engage and secure said va ves on said table, lmeans for manually rocking said rock shaft and lifting said ngers, means for automatically raising and lowering said table and rocking said rock shaft, valve stem clutches vertically mounted over said table and adapted to resiliently` hold said valve stems, and means for rotating said valvestem clutches vin alternately opposite directions.`

4. In a"machine for' grinding .portable valves having a frame, a vertical slidable table mountedl on said frame, and adapted to receive the valves to be ground, meansfor successively releasing said IVvalve stems from engagement with said table', comprising valve engaging lingers carried by said rock shaft, andV means for successively raising and loweringsaid table` and releasing said vngers, and means for rotating the vvalve stems in successively opposite directions. Y

' 5. In a machine for grinding valves, means forv holding' and rotating .the valve and valve stem comprising a shaft, a sleeve slidably supported-on said shaft, a head carried byV said sleeve having a bore to receive the valve stem and radially slidable members adapted to engage the valve stem in said bore, a sleeve rotatably and slidably mountedon said head and means for controlling said radially slidable members .operated by said last mentioned sleeve. Y a 6.- In a machine y for grinding valves,

-Vmean's for holding'kand .rotating the valve and valve stem comprising a shaft, a sleeve slidably mounted on said shaft, elastic means controlling said sleeve, a head carried by said sleeve having a bore to receive a valve stem, elastic means in said bore to engagea valve stem, radially slidable memberscarriedzin lsaid head adapted .to engage the `valve stem, elastic means tending to withdraw said radial members from said bore, afsecond sleeve carried by said head rotatable and slidable thereon, elastic means to hold said second sleeve depressed and means intermediate'- said second sleeve and said radial members, whereby the elevating of said sleeve will permit the withdrawal of said radial members from said bore and the releaseof the valve stem. YIn testimony Vwhereofrwe aiix Vour signa- 

